From Radiation Physics of Metals and Its Applications

6.1. INTRODUCTION

The processes of buildup of radiation defects, phase changes and general evolution of the microstructure of metals and alloys are accompanied by changes in the properties of irradiated materials. In structural materials of atomic and thermonuclear power engineering, the most important problems are associated with radiation hardening and emrittlement, swelling and changes of the characteristics of creep and long-term strength. The problems of low-temperature hardening and embrittlement are also very important for stabilising and superconducting materials of the magnetic systems of thermonuclear equipment and also structural materials for space technology. The solution of these problems depends greatly on the correct interpretation of the mechanisms of radiation damage and the development of methods of suppressing the negative effect of radiation.

The mechanisms of degradation of the properties of metallic materials in irradiation are linked with special features of the mechanisms of structural-phase changes, examined in previous chapters. It was shown that they are determined by the type of crystal lattice, chemical and phase composition, dislocation structure and irradiation parameters (temperature, type of radiation, irradiation energy, intensity and dose). In the actual operating conditions of materials in elements of sections and structures of nuclear power systems and other systems, the intensity and extent of degradation of the properties of irradiated materials and, on the whole, their service life, depend greatly on the nature and level of applied stresses, in addition to the previously mentioned factors. This problem is especially important for structural materials of the first wall of fusion reactors,...

Copyright L.I. Ivanov and Yu.M. Platov 2004 under license agreement with Books24x7

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Topics of Interest

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